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$\begin{figure} \par\includegraphics[angle=-90,width=13cm,clip]{4630fig2.eps}\end{figure}$ Figure 1: Plot of $\log (f_{\rm X}/f_{\rm O})$ versus $\log L_{\rm X}$ . Plotted here are values calculated from our XMM-Newton and Chandra data, as well as from the literature (see legend in the plot). For all samples, only galaxies which are classified as H II or absorption-line are plotted. All luminosities are for the same energy band (0.5-2.0 keV). The two dashed lines demarcate the regions of $\log (f_{\rm X}/f_{\rm O})$ $-L_{\rm X}$ space which may be inhabited mainly either by NGs ( $\log L_{\rm X} < 42$ , $\log (f_{\rm X}/f_{\rm O})$ <-2) or by AGN. The dash-dotted line indicates an estimate for $\log (f_{\rm X}/f_{\rm O})$ from low mass X-ray binaries in a $10^{11} M_{\hbox {$\odot $ }}$ galaxy (see text).
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7cm,clip]{4630fig1.eps}\end{figure}$ Figure 2: Plot of $b_{\rm J}$ magnitude versus logarithmic X-ray flux for all galaxies in Tables 1 and 2. The region to the right of the line $\log (f_{\rm X}/f_{\rm O})$ =-1 is expected to be occupied mainly by AGN. NGs are expected to be found mainly in the region to the left of the line $\log (f_{\rm X}/f_{\rm O})$ =-2.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7cm,clip]{4630fig1.eps}\end{figure}$	Figure 2: Plot of $b_{\rm J}$ magnitude versus logarithmic X-ray flux for all galaxies in Tables 1 and 2. The region to the right of the line $\log (f_{\rm X}/f_{\rm O})$ =-1 is expected to be occupied mainly by AGN. NGs are expected to be found mainly in the region to the left of the line $\log (f_{\rm X}/f_{\rm O})$ =-2.
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